下列物质属于有机高分子化合物的是[ ] A．甲烷 B．二氧化碳 C．淀粉 D．金

我国反假货币“三师队伍”是指货币识别师、货币鉴别师）和货币鉴定师。

阅读理解。

     I come from a city on the United States'east coast. It's a ten-hour flight for me to get home from Shanghai. When I got off the plane, I took photos of the blue sky and white clouds along the way. After two weeks, I

returned to Shanghai. Much to my surprise, the blue sky in Shanghai that I liked before was not as blue as that

in the US. I couldn't help wondering what had happened.

      A few days later, I went to tour Waitan (a famous tourist attraction in Shanghai) by the Huangpu River with some of my friends. There we saw five Ferrari sports cars by the side of the road. The red and yellow cars looked so nice that everyone was looking at them. However, when I turned my head, I noticed the sky over Waitan, I was shocked to find that the buildings in the Lujiazui area on the other side of Huangpu River could hardly be

seen. It was then that I realized that Ferrari cars could be bought with money, but a blue sky couldn't.

     Shanghai is an important economic (经济的) and trade center in China. It has made great contributions (贡献) to the whole nation's economic development. However, we need to protect the environment during

economic growth. Pollution is poisoning our air and our rivers. Without clean air and rivers, how will people be

able to survive?

1. The author mentioned the Ferrari sports cars in order to _____.

A. tell us that Shanghai is a developed city

B. ask us to stop driving sports cars

C. tell us how much people like cars

D. focus our attention on air pollution

2. What can we learn about the author?

A. He comes from Shanghai.

B. He likes to visit different places.

C. He wants to buy a Ferrari sports car.

D. He is socially responsible (责任).

3. Who might be interested in this passage?

A. Those who love Ferrari sports cars.

B. Those who care about the environment.

C. Those who want to travel in Shanghai.

D. Those who like to take photos.

4. What is the best title for this passage?

A. Money Can Buy Ferraris, But Not a Blue Sky

B. Where People Should Live

C. Different Opinions on Cars

D. Different Places Have Different Skies

保障会计软件及计算机硬件的正常运行是软件编制人员的职责。( )

道德主要是依靠人们自觉的______来维持的。

A．内心信念

B．传统习惯

C．社会需求

D．传统观念

多组份精馏为饱和液体进料时，适宜的进料位置可采用Kirkbride经验方程式计算：

式中： NR、NS——精馏段、提馏段的理论板数；

zLF、zHF——进料中轻、重关键组份的摩尔分率；

xLW、xHD——塔釜轻关键组份、塔顶重关键组份的摩尔分率；

D、W——塔顶馏出液量、塔釜液量，kmol/h。

在一有29块理论板的精馏塔中分离三氯乙烯混合物，泡点进料，进料中三氯乙烯、三氯乙烷和四氯乙烷摩尔含量分别为45.6%、5.55%和48.85%，塔顶采用全凝器，塔底采用再沸器。要求塔顶产品三氯乙烯的摩尔含量为99.9%，三氯乙烷为0.1%，塔釜中三氯乙烯的摩尔含量为0.1%。由塔釜数起，计算的理论进料板位置是下述哪一个数据？（）

A．16

B．8

C．21

D．25